{"id":598,"date":"2023-09-26T22:22:18","date_gmt":"2023-09-26T14:22:18","guid":{"rendered":"https:\/\/www.escook.cn\/?p=598"},"modified":"2023-11-14T12:05:44","modified_gmt":"2023-11-14T04:05:44","slug":"react-hooks-%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e7%9b%b8%e5%85%b3%e7%9a%84-hooks","status":"publish","type":"post","link":"https:\/\/www.escook.cn\/index.php\/2023\/09\/26\/react-hooks-%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e7%9b%b8%e5%85%b3%e7%9a%84-hooks\/","title":{"rendered":"React Hooks – \u6027\u80fd\u4f18\u5316\u76f8\u5173\u7684 Hooks"},"content":{"rendered":"
\n

\u7248\u6743\u5f52\u4f5c\u8005 \u00a9\u5218\u9f99\u5bbe \u6240\u6709\uff0c\u672c\u6587\u7ae0\u672a\u7ecf\u4f5c\u8005\u5141\u8bb8\uff0c\u7981\u6b62\u79c1\u81ea\u8f6c\u8f7d\uff01<\/p>\n<\/blockquote>\n

1. React.memo<\/h2>\n

\u5f53\u7236\u7ec4\u4ef6\u88ab\u91cd\u65b0\u6e32\u67d3\u7684\u65f6\u5019\uff0c\u4e5f\u4f1a\u89e6\u53d1\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\uff0c\u8fd9\u6837\u5c31\u591a\u51fa\u4e86\u65e0\u610f\u4e49\u7684\u6027\u80fd\u5f00\u9500\u3002\u5982\u679c\u5b50\u7ec4\u4ef6\u7684\u72b6\u6001\u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0c\u5219\u5b50\u7ec4\u4ef6\u662f\u4e0d\u9700\u8981\u88ab\u91cd\u65b0\u6e32\u67d3\u7684\u3002<\/p>\n

\u5728 React Hooks \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 React.memo<\/code> \u6765\u89e3\u51b3\u4e0a\u8ff0\u7684\u95ee\u9898\uff0c\u4ece\u800c\u8fbe\u5230\u63d0\u9ad8\u6027\u80fd\u7684\u76ee\u7684\u3002<\/p>\n

React.memo<\/code> \u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n

const \u7ec4\u4ef6 = React.memo(\u51fd\u6570\u5f0f\u7ec4\u4ef6)<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u7236\u7ec4\u4ef6\u58f0\u660e\u4e86 count<\/code> \u548c flag<\/code> \u4e24\u4e2a\u72b6\u6001\uff0c\u5b50\u7ec4\u4ef6\u4f9d\u8d56\u4e8e\u7236\u7ec4\u4ef6\u901a\u8fc7 props \u4f20\u9012\u7684 num<\/code>\u3002\u5f53\u7236\u7ec4\u4ef6\u4fee\u6539 flag \u7684\u503c\u65f6\uff0c\u4f1a\u5bfc\u81f4\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\uff1a<\/p>\n
import React, { useEffect, useState } from 'react'\n\n\/\/ \u7236\u7ec4\u4ef6\nexport const Father: React.FC = () => {\n  \/\/ \u5b9a\u4e49 count \u548c flag \u4e24\u4e2a\u72b6\u6001\n  const [count, setCount] = useState(0)\n  const [flag, setFlag] = useState(false)\n\n  return (\n    <>\n      <h1>\u7236\u7ec4\u4ef6<\/h1>\n      <p>count \u7684\u503c\u662f\uff1a{count}<\/p>\n      <p>flag \u7684\u503c\u662f\uff1a{String(flag)}<\/p>\n      <button onClick={() => setCount((prev) => prev + 1)}>+1<\/button>\n      <button onClick={() => setFlag((prev) => !prev)}>Toggle<\/button>\n      <hr \/>\n      <Son num={count} \/>\n    <\/>\n  )\n}\n\n\/\/ \u5b50\u7ec4\u4ef6\uff1a\u4f9d\u8d56\u4e8e\u7236\u7ec4\u4ef6\u901a\u8fc7 props \u4f20\u9012\u8fdb\u6765\u7684 num\nexport const Son: React.FC<{ num: number }> = ({ num }) => {\n  useEffect(() => {\n    console.log('\u89e6\u53d1\u4e86\u5b50\u7ec4\u4ef6\u7684\u6e32\u67d3')\n  })\n  return (\n    <>\n      <h3>\u5b50\u7ec4\u4ef6 {num}<\/h3>\n    <\/>\n  )\n}<\/code><\/pre>\n
\u6211\u4eec\u4f7f\u7528 React.memo(\u51fd\u6570\u5f0f\u7ec4\u4ef6)<\/code> \u5c06\u5b50\u7ec4\u4ef6\u5305\u88f9\u8d77\u6765\uff0c\u53ea\u6709\u5b50\u7ec4\u4ef6\u4f9d\u8d56\u7684 props \u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\uff0c\u624d\u4f1a\u89e6\u53d1\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\/\/ \u5b50\u7ec4\u4ef6\uff1a\u4f9d\u8d56\u4e8e\u7236\u7ec4\u4ef6\u901a\u8fc7 props \u4f20\u9012\u8fdb\u6765\u7684 num\nexport const Son: React.FC<{ num: number }> = React.memo(({ num }) => {\n  useEffect(() => {\n    console.log('\u89e6\u53d1\u4e86\u5b50\u7ec4\u4ef6\u7684\u6e32\u67d3')\n  })\n  return (\n    <>\n      <h3>\u5b50\u7ec4\u4ef6 --- {num}<\/h3>\n    <\/>\n  )\n})<\/code><\/pre>\n
2. useMemo<\/h2>\n
1. \u95ee\u9898\u5f15\u5165<\/h3>\n
\u8fdb\u4e00\u6b65\u6539\u9020\u524d\u9762\u7684\u6848\u4f8b\uff1a\u6211\u4eec\u5e0c\u671b\u5728 Father<\/code> \u7ec4\u4ef6\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u201c\u8ba1\u7b97\u5c5e\u6027\u201d\uff0c\u6839\u636e flag \u503c\u7684\u771f\u5047\uff0c\u52a8\u6001\u8fd4\u56de\u4e00\u6bb5\u6587\u672c\u5185\u5bb9\uff0c\u5e76\u628a\u8ba1\u7b97\u7684\u7ed3\u679c\u663e\u793a\u5230\u9875\u9762\u4e0a\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\/\/ \u7236\u7ec4\u4ef6\nexport const Father: React.FC = () => {\n  \/\/ \u5b9a\u4e49 count \u548c flag \u4e24\u4e2a\u72b6\u6001\n  const [count, setCount] = useState(0)\n  const [flag, setFlag] = useState(false)\n\n  \/\/ \u6839\u636e\u5e03\u5c14\u503c\u8fdb\u884c\u8ba1\u7b97\uff0c\u52a8\u6001\u8fd4\u56de\u5185\u5bb9\n  const tips = () => {\n    console.log('\u89e6\u53d1\u4e86 tips \u7684\u91cd\u65b0\u8ba1\u7b97')\n    return flag ? <p>\u54ea\u91cc\u8d35\u4e86\uff0c\u4e0d\u8981\u7741\u7740\u773c\u778e\u8bf4\u597d\u4e0d\u597d<\/p> : <p>\u8fd9\u4e9b\u5e74\u6709\u6ca1\u6709\u52aa\u529b\u5de5\u4f5c\uff0c\u5de5\u8d44\u6da8\u6ca1\u6da8<\/p>\n  }\n\n  return (\n    <>\n      <h1>\u7236\u7ec4\u4ef6<\/h1>\n      <p>count \u7684\u503c\u662f\uff1a{count}<\/p>\n      <p>flag \u7684\u503c\u662f\uff1a{String(flag)}<\/p>\n      {tips()}\n      <button onClick={() => setCount((prev) => prev + 1)}>+1<\/button>\n      <button onClick={() => setFlag((prev) => !prev)}>Toggle<\/button>\n      <hr \/>\n      <Son num={count} \/>\n    <\/>\n  )\n}<\/code><\/pre>\n
\u4ee3\u7801\u7f16\u5199\u5b8c\u6bd5\u540e\uff0c\u6211\u4eec\u70b9\u51fb\u7236\u7ec4\u4ef6\u4e2d\u7684 +1 \u6309\u94ae<\/strong>\uff0c\u53d1\u73b0 count \u5728\u81ea\u589e\uff0c\u800c flag \u7684\u503c\u4e0d\u4f1a\u53d1\u751f\u53d8\u5316\u3002\u6b64\u65f6\u4e5f\u4f1a\u89e6\u53d1 tips<\/code> \u51fd\u6570\u7684\u91cd\u65b0\u6267\u884c\uff0c\u8fd9\u5c31\u9020\u6210\u4e86\u6027\u80fd\u7684\u6d6a\u8d39\u3002\u6211\u4eec\u5e0c\u671b\u5982\u679c flag<\/code> \u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0c\u5219\u907f\u514d tips<\/code> \u51fd\u6570\u7684\u91cd\u65b0\u8ba1\u7b97\uff0c\u4ece\u800c\u4f18\u5316\u6027\u80fd\u3002\u6b64\u65f6\u9700\u8981\u7528\u5230 React Hooks \u63d0\u4f9b\u7684 useMemo<\/strong> API\u3002<\/p>\n
2. useMemo \u7684\u8bed\u6cd5\u683c\u5f0f<\/h3>\n
useMemo \u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n
const memorizedValue = useMemo(cb, array)\n\nconst memoValue = useMemo(() => {\n  return \u8ba1\u7b97\u5f97\u5230\u7684\u503c\n}, [value]) \/\/ \u8868\u793a\u76d1\u542c value \u7684\u53d8\u5316<\/code><\/pre>\n
\u5176\u4e2d\uff1a<\/p>\n
    \n
  1. cb\uff1a\u8fd9\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u5904\u7406\u8ba1\u7b97\u7684\u903b\u8f91\uff0c\u5fc5\u987b\u4f7f\u7528 return \u8fd4\u56de\u8ba1\u7b97\u7684\u7ed3\u679c<\/li>\n
  2. array\uff1a\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u5b58\u50a8\u7684\u662f\u4f9d\u8d56\u9879\uff0c\u53ea\u8981\u4f9d\u8d56\u9879\u53d1\u751f\u53d8\u5316\uff0c\u90fd\u4f1a\u89e6\u53d1 cb \u7684\u91cd\u65b0\u6267\u884c\u3002\u4f7f\u7528 array \u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\n
      \n
    • \u4e0d\u4f20\u6570\u7ec4\uff0c\u6bcf\u6b21\u66f4\u65b0\u90fd\u4f1a\u91cd\u65b0\u8ba1\u7b97<\/li>\n
    • \u7a7a\u6570\u7ec4\uff0c\u53ea\u4f1a\u8ba1\u7b97\u4e00\u6b21<\/li>\n
    • \u4f9d\u8d56\u5bf9\u5e94\u7684\u503c\uff0c\u5bf9\u5e94\u7684\u503c\u53d1\u751f\u53d8\u5316\u65f6\u4f1a\u91cd\u65b0\u6267\u884c cb<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
      3. \u4f7f\u7528 useMemo \u89e3\u51b3\u521a\u624d\u7684\u95ee\u9898<\/h3>\n
        \n
      1. \n
        \u5bfc\u5165 useMemo\uff1a<\/p>\n
        import React, { useEffect, useState, useMemo } from 'react'<\/code><\/pre>\n<\/li>\n
      2. \n
        \u5728 Father \u7ec4\u4ef6\u4e2d\uff0c\u4f7f\u7528 useMemo<\/code> \u5bf9 tips<\/code> \u8fdb\u884c\u6539\u9020\uff1a<\/p>\n
        \/\/ \u6839\u636e\u5e03\u5c14\u503c\u8fdb\u884c\u8ba1\u7b97\uff0c\u52a8\u6001\u8fd4\u56de\u5185\u5bb9\nconst tips = useMemo(() => {\n console.log('\u89e6\u53d1\u4e86 tips \u7684\u91cd\u65b0\u8ba1\u7b97')\n return flag ? 
        \u54ea\u91cc\u8d35\u4e86\uff0c\u4e0d\u8981\u7741\u7740\u773c\u778e\u8bf4\u597d\u4e0d\u597d<\/p> : 
        \u8fd9\u4e9b\u5e74\u6709\u6ca1\u6709\u52aa\u529b\u5de5\u4f5c\uff0c\u5de5\u8d44\u6da8\u6ca1\u6da8<\/p>\n}, [flag])<\/code><\/pre>\n<\/li>\n
      3. \n
        \u6b64\u65f6\uff0c\u70b9\u51fb Father \u4e2d\u7684 +1 \u6309\u94ae\uff0c\u5e76\u4e0d\u4f1a\u89e6\u53d1 tips<\/code> \u7684\u91cd\u65b0\u8ba1\u7b97\uff0c\u800c\u662f\u4f1a\u4f7f\u7528\u4e0a\u4e00\u6b21\u7f13\u5b58\u7684\u503c\u8fdb\u884c\u6e32\u67d3\u3002\u53ea\u6709\u4f9d\u8d56\u9879 flag<\/code> \u53d8\u5316\u65f6\uff0c\u624d\u4f1a\u89e6\u53d1 tips<\/code> \u7684\u91cd\u65b0\u8ba1\u7b97\u3002<\/p>\n<\/li>\n<\/ol>\n
        3. useCallback<\/h2>\n
        \u8bed\u6cd5\u683c\u5f0f<\/h3>\n
        \u4e4b\u524d\u6211\u4eec\u6240\u5b66\u7684 useMemo<\/code> \u80fd\u591f\u8fbe\u5230\u7f13\u5b58\u67d0\u4e2a\u53d8\u91cf\u503c\u7684\u6548\u679c\uff0c\u800c\u5f53\u524d\u8981\u5b66\u4e60\u7684 useCallback<\/code> \u7528\u6765\u5bf9\u7ec4\u4ef6\u5185\u7684\u51fd\u6570\u8fdb\u884c\u7f13\u5b58\uff0c\u5b83\u8fd4\u56de\u7684\u662f\u7f13\u5b58\u7684\u51fd\u6570\u3002\u5b83\u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n
        const memoCallback = useCallback(cb, array)<\/code><\/pre>\n
        useCallback \u4f1a\u8fd4\u56de\u4e00\u4e2a memorized \u56de\u8c03\u51fd\u6570\u4f9b\u7ec4\u4ef6\u4f7f\u7528\uff0c\u4ece\u800c\u9632\u6b62\u7ec4\u4ef6\u6bcf\u6b21 rerender \u65f6\u53cd\u590d\u521b\u5efa\u76f8\u540c\u7684\u51fd\u6570\uff0c\u80fd\u591f\u8282\u7701\u5185\u5b58\u5f00\u9500\uff0c\u63d0\u9ad8\u6027\u80fd\u3002\u5176\u4e2d\uff1a<\/p>\n
          \n
        1. cb \u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u5904\u7406\u4e1a\u52a1\u903b\u8f91\uff0c\u8fd9\u4e2a cb \u5c31\u662f\u9700\u8981\u88ab\u7f13\u5b58\u7684\u51fd\u6570<\/li>\n
        2. array \u662f\u4f9d\u8d56\u9879\u5217\u8868\uff0c\u5f53 array \u4e2d\u7684\u4f9d\u8d56\u9879\u53d8\u5316\u65f6\u624d\u4f1a\u91cd\u65b0\u6267\u884c useCallback\u3002\n
            \n
          • \u5982\u679c\u7701\u7565 array\uff0c\u5219\u6bcf\u6b21\u66f4\u65b0\u90fd\u4f1a\u91cd\u65b0\u8ba1\u7b97<\/li>\n
          • \u5982\u679c array \u4e3a\u7a7a\u6570\u7ec4\uff0c\u5219\u53ea\u4f1a\u5728\u7ec4\u4ef6\u7b2c\u4e00\u6b21\u521d\u59cb\u5316\u7684\u65f6\u5019\u8ba1\u7b97\u4e00\u6b21<\/li>\n
          • \u5982\u679c array \u4e0d\u4e3a\u7a7a\u6570\u7ec4\uff0c\u5219\u53ea\u6709\u5f53\u4f9d\u8d56\u9879\u7684\u503c\u53d8\u5316\u65f6\uff0c\u624d\u4f1a\u91cd\u65b0\u8ba1\u7b97<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
            \u57fa\u672c\u793a\u4f8b<\/h3>\n
            \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u901a\u8fc7\u4e0b\u9762\u7684\u4f8b\u5b50\u6f14\u793a\u4f7f\u7528 useCallback \u7684\u5fc5\u8981\u6027\uff1a\u5f53\u8f93\u5165\u6846\u89e6\u53d1 onChange \u4e8b\u4ef6\u65f6\uff0c\u4f1a\u7ed9 kw \u91cd\u65b0\u8d4b\u503c\u3002kw \u503c\u7684\u6539\u53d8\u4f1a\u5bfc\u81f4\u7ec4\u4ef6\u7684 rerender\uff0c\u800c\u7ec4\u4ef6\u7684 rerender \u4f1a\u5bfc\u81f4\u53cd\u590d\u521b\u5efa onKwChange<\/strong> \u51fd\u6570\u5e76\u6dfb\u52a0\u5230 Set \u96c6\u5408\u4e2d\uff0c\u9020\u6210\u4e86\u4e0d\u5fc5\u8981\u7684\u5185\u5b58\u6d6a\u8d39\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
            import React, { useState, useCallback } from 'react'\n\n\/\/ \u7528\u6765\u5b58\u50a8\u51fd\u6570\u7684 set \u96c6\u5408\nconst set = new Set()\n\nexport const Search: React.FC = () => {\n  const [kw, setKw] = useState('')\n\n  const onKwChange = (e: React.ChangeEvent<HTMLInputElement>) => {\n    setKw(e.currentTarget.value)\n  }\n\n  \/\/ \u628a onKwChange \u51fd\u6570\u7684\u5f15\u7528\uff0c\u5b58\u50a8\u5230 set \u96c6\u5408\u4e2d\n  set.add(onKwChange)\n  \/\/ \u6253\u5370 set \u96c6\u5408\u4e2d\u5143\u7d20\u7684\u6570\u91cf\n  console.log('set \u4e2d\u51fd\u6570\u7684\u6570\u91cf\u4e3a\uff1a' + set.size)\n\n  return (\n    <>\n      <input type="text" value={kw} onChange={onKwChange} \/>\n      <hr \/>\n      <p>{kw}<\/p>\n      <p><\/p>\n    <\/>\n  )\n}<\/code><\/pre>\n
            \u8fd0\u884c\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u6211\u4eec\u53d1\u73b0\u6bcf\u6b21\u6587\u672c\u6846\u7684\u503c\u53d1\u751f\u53d8\u5316\uff0c\u90fd\u4f1a\u6253\u5370 set.size<\/code> \u7684\u503c\uff0c\u800c\u4e14\u8fd9\u4e2a\u503c\u4e00\u76f4\u5728\u81ea\u589e +1\uff0c\u56e0\u4e3a\u6bcf\u6b21\u7ec4\u4ef6 rerender \u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 onKwChange \u51fd\u6570\u6dfb\u52a0\u5230 set \u96c6\u5408\u4e2d\u3002<\/p>\n
            \u4e3a\u4e86\u9632\u6b62 Search<\/code> \u7ec4\u4ef6 rerender \u65f6\u6bcf\u6b21\u90fd\u4f1a\u91cd\u65b0\u521b\u5efa onKwChange<\/code> \u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 useCallback \u5bf9\u8fd9\u4e2a\u51fd\u6570\u8fdb\u884c\u7f13\u5b58\u3002\u6539\u9020\u540e\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
            import React, { useState, useCallback } from 'react'\n\n\/\/ \u7528\u6765\u5b58\u50a8\u51fd\u6570\u7684 set \u96c6\u5408\nconst set = new Set()\n\nexport const Search: React.FC = () => {\n  const [kw, setKw] = useState('')\n\n  const onKwChange = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {\n    setKw(e.currentTarget.value)\n  }, [])\n\n  \/\/ \u628a onKwChange \u51fd\u6570\u7684\u5f15\u7528\uff0c\u5b58\u50a8\u5230 set \u96c6\u5408\u4e2d\n  set.add(onKwChange)\n  \/\/ \u6253\u5370 set \u96c6\u5408\u4e2d\u5143\u7d20\u7684\u6570\u91cf\n  console.log('set \u4e2d\u51fd\u6570\u7684\u6570\u91cf\u4e3a\uff1a' + set.size)\n\n  return (\n    <>\n      <input type="text" value={kw} onChange={onKwChange} \/>\n      <hr \/>\n      <p>{kw}<\/p>\n      <p><\/p>\n    <\/>\n  )\n}<\/code><\/pre>\n
            \u8fd0\u884c\u6539\u9020\u540e\u7684\u4ee3\u7801\uff0c\u6211\u4eec\u53d1\u73b0\u65e0\u8bba input \u7684\u503c\u5982\u4f55\u53d1\u751f\u53d8\u5316\uff0c\u6bcf\u6b21\u6253\u5370\u7684 set.size<\/code> \u7684\u503c\u90fd\u662f 1\u3002\u8bc1\u660e\u6211\u4eec\u4f7f\u7528 useCallback \u5b9e\u73b0\u4e86\u5bf9\u51fd\u6570\u7684\u7f13\u5b58\u3002<\/p>\n
            useCallback \u7684\u6848\u4f8b<\/h3>\n
            1. \u95ee\u9898\u5f15\u5165<\/h4>\n
              \n
            1. \n
              \u5bfc\u5165\u9700\u8981\u7684 hooks \u51fd\u6570\uff0c\u5e76\u5b9a\u4e49\u9700\u8981\u7684 TS \u7c7b\u578b\uff1a<\/p>\n
              import React, { useEffect, useState, useCallback } from 'react'\n\n\/\/ \u6587\u672c\u6846\u7ec4\u4ef6\u7684 props \u7c7b\u578b\ntype SearchInputType = { onChange: (e: React.ChangeEvent) => void }\n\/\/ \u5355\u8bcd\u5bf9\u8c61\u7684 TS \u7c7b\u578b\ntype WordType = { id: number; word: string }<\/code><\/pre>\n<\/li>\n
            2. \n
              \u5b9a\u4e49 SearchInput<\/strong> \u641c\u7d22\u6846\u5b50\u7ec4\u4ef6\uff0c\u63a5\u6536\u7236\u7ec4\u4ef6\u4f20\u9012\u8fdb\u6765\u7684 onChange<\/strong> \u5904\u7406\u51fd\u6570\uff0c\u6bcf\u5f53 input \u89e6\u53d1 onChange \u4e8b\u4ef6\u65f6\uff0c\u8c03\u7528 props.onChange<\/code> \u8fdb\u884c\u5904\u7406\uff1a<\/p>\n
              \/\/ \u5b50\u7ec4\u4ef6\nconst SearchInput: React.FC<SearchInputType> = (props) => {\n useEffect(() => {\n   console.log('\u89e6\u53d1\u4e86 SearchInput \u7684 rerender')\n })\n\n return <input onChange={props.onChange} placeholder="\u8bf7\u8f93\u5165\u641c\u7d22\u5173\u952e\u5b57" \/>\n}<\/code><\/pre>\n<\/li>\n
            3. \n
              \u5b9a\u4e49 SearchResult<\/strong> \u641c\u7d22\u7ed3\u679c\u5b50\u7ec4\u4ef6\uff0c\u63a5\u6536\u7236\u7ec4\u4ef6\u4f20\u9012\u8fdb\u6765\u7684 query<\/strong> \u641c\u7d22\u5173\u952e\u5b57\uff0c\u5728 useEffect \u4e2d\u76d1\u542c props.query<\/code> \u7684\u53d8\u5316\uff0c\u4ece\u800c\u8bf7\u6c42\u641c\u7d22\u7684\u7ed3\u679c\uff1a<\/p>\n
              \/\/ \u5b50\u7ec4\u4ef6\uff1a\u641c\u7d22\u7ed3\u679c\nconst SearchResult: React.FC<{ query: string }> = (props) => {\n const [list, setList] = useState([])\n\n useEffect(() => {\n   \/\/ \u5982\u679c query \u4e3a\u7a7a\u5b57\u7b26\u4e32\uff0c\u5219\u6e05\u7a7a\u5f53\u524d\u7684\u5217\u8868\n   if (!props.query) return setList([])\n\n   \/\/ \u67e5\u8be2\u6570\u636e\n   fetch('https:\/\/api.liulongbin.top\/v1\/words?kw=' + props.query)\n     .then((res) => res.json())\n     .then((res) => {\n       \/\/ \u4e3a\u5217\u8868\u8d4b\u503c\n       setList(res.data)\n     })\n }, [props.query])\n\n \/\/ \u6e32\u67d3\u5217\u8868\u6570\u636e\n return list.map((item) => 
              {item.word}<\/p>)\n}<\/code><\/pre>\n<\/li>\n
            4. \n
              \u5b9a\u4e49\u7236\u7ec4\u4ef6 SearchBox<\/strong> \u5e76\u6e32\u67d3 SearchInput<\/strong> \u7ec4\u4ef6\u548c SearchResult<\/strong> \u7ec4\u4ef6\u3002\u5728\u7236\u7ec4\u4ef6\u4e2d\u76d1\u542c SearchInput<\/strong> \u7684 onChange<\/code> \u4e8b\u4ef6\uff0c\u5e76\u628a\u7236\u7ec4\u4ef6\u4e2d\u5b9a\u4e49\u7684\u5904\u7406\u51fd\u6570 onKwChange<\/code> \u4f20\u9012\u8fdb\u53bb\u3002\u540c\u65f6\uff0c\u628a\u7236\u7ec4\u4ef6\u4e2d\u5b9a\u4e49\u7684\u641c\u7d22\u5173\u952e\u5b57 kw<\/code> \u4f20\u9012\u7ed9 SearchResult<\/strong> \u7ec4\u4ef6\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
              \/\/ \u7236\u7ec4\u4ef6\nexport const SearchBox: React.FC = () => {\n const [kw, setKw] = useState('')\n\n const onKwChange = (e: React.ChangeEvent<HTMLInputElement>) => {\n   setKw(e.currentTarget.value)\n }\n\n return (\n   <div style={{ height: 500 }}>\n     <SearchInput onChange={onKwChange} \/>\n     <hr \/>\n     <SearchResult query={kw} \/>\n   <\/div>\n )\n}<\/code><\/pre>\n<\/li>\n
            5. \n
              \u7ecf\u8fc7\u6d4b\u8bd5\u540e\uff0c\u6211\u4eec\u53d1\u73b0\uff1a<\/p>\n
                \n
              1. \u6bcf\u5f53\u5b50\u7ec4\u4ef6\u7684\u6587\u672c\u6846\u5185\u5bb9\u53d1\u751f\u53d8\u5316\uff0c\u90fd\u4f1a\u8c03\u7528 props.onChange<\/code> \u628a\u6570\u636e\u53d1\u9001\u7ed9\u7236\u7ec4\u4ef6\u3002<\/li>\n
              2. \u76f8\u5e94\u7684\uff0c\u7236\u7ec4\u4ef6\u901a\u8fc7 onKwChange<\/strong> \u51fd\u6570\u53ef\u4ee5\u83b7\u53d6\u5230\u5b50\u7ec4\u4ef6\u7684\u503c\uff0c\u5e76\u628a\u503c\u66f4\u65b0\u5230 kw<\/code> \u4e2d\u3002\u5f53 kw \u53d1\u751f\u53d8\u5316\uff0c\u4f1a\u89e6\u53d1\u7236\u7ec4\u4ef6\u7684 rerender\u3002<\/li>\n
              3. \u800c\u7236\u7ec4\u4ef6\u7684 rerender \u53c8\u4f1a\u91cd\u65b0\u751f\u6210 onKwChange<\/strong> \u51fd\u6570\u5e76\u628a\u51fd\u6570\u7684\u5f15\u7528\u4f5c\u4e3a props \u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u3002<\/li>\n
              4. \u8fd9\u6837\uff0c\u5b50\u7ec4\u4ef6\u5c31\u76d1\u542c\u5230\u4e86 props<\/code> \u7684\u53d8\u5316\uff0c\u6700\u7ec8\u5bfc\u81f4\u5b50\u7ec4\u4ef6\u7684 rerender\u3002 <\/li>\n<\/ol>\n
                \u5176\u5b9e\uff0c\u5b50\u7ec4\u4ef6\u6839\u672c\u4e0d\u9700\u8981\u88ab\u91cd\u65b0\u6e32\u67d3\uff0c\u56e0\u4e3a props.onChange<\/code> \u51fd\u6570\u7684\u5904\u7406\u903b\u8f91\u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0c\u53ea\u662f\u5b83\u7684\u5f15\u7528\u6bcf\u6b21\u90fd\u5728\u53d8\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u9700\u8981\u7528\u5230 useCallback<\/strong> \u548c React.memo<\/strong>\u3002<\/p>\n<\/li>\n<\/ol>\n
                2. \u95ee\u9898\u89e3\u51b3<\/h4>\n
                  \n
                1. \n
                  \u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u8ba9\u5b50\u7ec4\u4ef6 SearchInput<\/strong> \u88ab\u7f13\u5b58\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4f7f\u7528 React.memo<\/code> \u5bf9\u5176\u8fdb\u884c\u6539\u9020\uff1a<\/p>\n
                  \/\/ \u5b50\u7ec4\u4ef6\uff1a\u641c\u7d22\u6846\nconst SearchInput: React.FC<SearchInputType> = React.memo((props) => {\n useEffect(() => {\n   console.log('\u89e6\u53d1\u4e86 SearchInput \u7684 rerender')\n })\n\n return <input onChange={props.onChange} placeholder="\u8bf7\u8f93\u5165\u641c\u7d22\u5173\u952e\u5b57" \/>\n})<\/code><\/pre>\n<\/li>\n
                2. \n
                  \u4f7f\u7528 React.memo<\/code> \u5bf9\u7ec4\u4ef6\u8fdb\u884c\u7f13\u5b58\u540e\uff0c\u5982\u679c\u5b50\u7ec4\u4ef6\u7684 props \u5728\u4e24\u6b21\u66f4\u65b0\u524d\u540e\u6ca1\u6709\u4efb\u4f55\u53d8\u5316\uff0c\u5219\u88ab memo \u7684\u7ec4\u4ef6\u4e0d\u4f1a rerender\u3002<\/p>\n
                  \u6240\u4ee5\u4e3a\u4e86\u5b9e\u73b0 SearchInput \u7684\u7f13\u5b58\uff0c\u8fd8\u9700\u8981\u57fa\u4e8e useCallback<\/code> \u628a\u7236\u7ec4\u4ef6\u4f20\u9012\u8fdb\u6765\u7684 onChange<\/strong> \u8fdb\u884c\u7f13\u5b58\u3002<\/p>\n
                  \u5728\u7236\u7ec4\u4ef6\u4e2d\u9488\u5bf9 onKwChange<\/strong> \u8c03\u7528 useCallback\uff0c\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
                  const onKwChange = useCallback((e: React.ChangeEvent) => {\n setKw(e.currentTarget.value)\n}, [])<\/code><\/pre>\n<\/li>\n
                3. \n
                  \u7ecf\u8fc7\u6d4b\u8bd5\uff0c\u6211\u4eec\u53d1\u73b0\u6bcf\u5f53\u6587\u672c\u6846\u5185\u5bb9\u53d1\u751f\u53d8\u5316\uff0c\u4e0d\u4f1a\u5bfc\u81f4 SearchInput \u7ec4\u4ef6\u7684 rerender\u3002<\/p>\n<\/li>\n<\/ol>\n
                  4. useTransition<\/h2>\n
                  1. \u95ee\u9898\u5f15\u5165<\/h3>\n
                  useTransition<\/code> \u53ef\u4ee5\u5c06\u4e00\u4e2a\u66f4\u65b0\u8f6c\u4e3a\u4f4e\u4f18\u5148\u7ea7<\/strong>\u66f4\u65b0\uff0c\u4f7f\u5176\u53ef\u4ee5\u88ab\u6253\u65ad<\/strong>\uff0c\u4e0d\u963b\u585e UI<\/strong> \u5bf9\u7528\u6237\u64cd\u4f5c\u7684\u54cd\u5e94\uff0c\u80fd\u591f\u63d0\u9ad8\u7528\u6237\u7684\u4f7f\u7528\u4f53\u9a8c\u3002\u5b83\u5e38\u7528\u4e8e\u4f18\u5316\u89c6\u56fe\u5207\u6362<\/strong>\u65f6\u7684\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n
                  \u4f8b\u5982\u6709\u4ee5\u4e0b3\u4e2a\u6807\u7b7e\u9875\u7ec4\u4ef6\uff0c\u5206\u522b\u662f Home<\/code>\u3001Movie<\/code>\u3001About<\/code>\uff0c\u5176\u4e2d Movie \u662f\u4e00\u4e2a\u6e32\u67d3\u7279\u522b\u8017\u65f6\u7684\u7ec4\u4ef6\uff0c\u5728\u6e32\u67d3 Movie \u7ec4\u4ef6\u671f\u95f4\u9875\u9762\u7684 UI \u4f1a\u88ab\u963b\u585e\uff0c\u7528\u6237\u4f1a\u611f\u89c9\u9875\u9762\u5341\u5206\u5361\u987f\uff0c\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
                  import React, { useState } from 'react'\n\nexport const TabsContainer: React.FC = () => {\n  \/\/ \u88ab\u6fc0\u6d3b\u7684\u6807\u7b7e\u9875\u7684\u540d\u5b57\n  const [activeTab, setActiveTab] = useState('home')\n\n  \/\/ \u70b9\u51fb\u6309\u94ae\uff0c\u5207\u6362\u6fc0\u6d3b\u7684\u6807\u7b7e\u9875\n  const onClickHandler = (tabName: string) => {\n    setActiveTab(tabName)\n  }\n\n  return (\n    <div style={{ height: 500 }}>\n      <TabButton isActive={activeTab === 'home'} onClick={() => onClickHandler('home')}>\n        \u9996\u9875\n      <\/TabButton>\n      <TabButton isActive={activeTab === 'movie'} onClick={() => onClickHandler('movie')}>\n        \u7535\u5f71\n      <\/TabButton>\n      <TabButton isActive={activeTab === 'about'} onClick={() => onClickHandler('about')}>\n        \u5173\u4e8e\n      <\/TabButton>\n      <hr \/>\n\n      {\/* \u6839\u636e\u88ab\u6fc0\u6d3b\u7684\u6807\u7b7e\u540d\uff0c\u6e32\u67d3\u5bf9\u5e94\u7684 tab \u7ec4\u4ef6 *\/}\n      {activeTab === 'home' && <HomeTab \/>}\n      {activeTab === 'movie' && <MovieTab \/>}\n      {activeTab === 'about' && <AboutTab \/>}\n    <\/div>\n  )\n}\n\n\/\/ Button \u7ec4\u4ef6 props \u7684 TS \u7c7b\u578b\ntype TabButtonType = React.PropsWithChildren & { isActive: boolean; onClick: () => void }\n\/\/ Button \u7ec4\u4ef6\nconst TabButton: React.FC<TabButtonType> = (props) => {\n  const onButtonClick = () => {\n    props.onClick()\n  }\n\n  return (\n    <button className={['btn', props.isActive && 'active'].join(' ')} onClick={onButtonClick}>\n      {props.children}\n    <\/button>\n  )\n}\n\n\/\/ Home \u7ec4\u4ef6\nconst HomeTab: React.FC = () => {\n  return <>HomeTab<\/>\n}\n\n\/\/ Movie \u7ec4\u4ef6\nconst MovieTab: React.FC = () => {\n  const items = Array(100000)\n    .fill('MovieTab')\n    .map((item, i) => <p key={i}>{item}<\/p>)\n  return items\n}\n\n\/\/ About \u7ec4\u4ef6\nconst AboutTab: React.FC = () => {\n  return <>AboutTab<\/>\n}<\/code><\/pre>\n
                  \u914d\u5957\u7684 CSS \u6837\u5f0f\u4e3a\uff1a<\/p>\n
                  .btn {\n  margin: 5px;\n  background-color: rgb(8, 92, 238);\n  color: #fff;\n  transition: opacity 0.5s ease;\n}\n\n.btn:hover {\n  opacity: 0.6;\n  transition: opacity 0.5s ease;\n}\n\n.btn.active {\n  background-color: rgb(3, 150, 0);\n}<\/code><\/pre>\n
                  2. \u8bed\u6cd5\u683c\u5f0f<\/h3>\n
                  import { useTransition } from 'react';\n\nfunction TabContainer() {\n  const [isPending, startTransition] = useTransition();\n  \/\/ \u2026\u2026\n}<\/code><\/pre>\n
                  \u53c2\u6570<\/strong>\uff1a<\/p>\n
                    \n
                  • \u8c03\u7528 useTransition<\/code> \u65f6\u4e0d\u9700\u8981\u4f20\u9012\u4efb\u4f55\u53c2\u6570<\/li>\n<\/ul>\n
                    \u8fd4\u56de\u503c<\/strong>\uff08\u6570\u7ec4\uff09\uff1a<\/p>\n
                      \n
                    • isPending<\/code> \u5e03\u5c14\u503c\uff1a\u662f\u5426\u5b58\u5728\u5f85\u5904\u7406\u7684 transition\uff0c\u5982\u679c\u503c\u4e3a true\uff0c\u8bf4\u660e\u9875\u9762\u4e0a\u5b58\u5728\u5f85\u6e32\u67d3\u7684\u90e8\u5206\uff0c\u53ef\u4ee5\u7ed9\u7528\u6237\u5c55\u793a\u4e00\u4e2a\u52a0\u8f7d\u7684\u63d0\u793a<\/li>\n
                    • startTransition<\/code> \u51fd\u6570\uff1a\u8c03\u7528\u6b64\u51fd\u6570\uff0c\u53ef\u4ee5\u628a\u72b6\u6001\u7684\u66f4\u65b0<\/strong>\u6807\u8bb0\u4e3a\u4f4e\u4f18\u5148\u7ea7<\/strong>\u7684\uff0c\u4e0d\u963b\u585e UI \u5bf9\u7528\u6237\u64cd\u4f5c\u7684\u54cd\u5e94<\/li>\n<\/ul>\n
                      3. \u95ee\u9898\u89e3\u51b3<\/h3>\n
                      \u4fee\u6539 TabsContainer<\/code> \u7ec4\u4ef6\uff0c\u4f7f\u7528 useTransition<\/code> \u628a\u70b9\u51fb\u6309\u94ae\u540e\u4e3a activeTab<\/code> \u8d4b\u503c\u7684\u64cd\u4f5c\uff0c\u6807\u8bb0\u4e3a\u4f4e\u4f18\u5148\u7ea7<\/strong>\u3002\u6b64\u65f6 React \u4f1a\u4f18\u5148\u54cd\u5e94\u7528\u6237\u5bf9\u754c\u9762\u7684\u5176\u5b83\u64cd\u4f5c\uff0c\u4ece\u800c\u4fdd\u8bc1 UI \u4e0d\u88ab\u963b\u585e\uff1a<\/p>\n
                      import React, { useState, useTransition } from 'react'\n\nexport const TabsContainer: React.FC = () => {\n  \/\/ \u88ab\u6fc0\u6d3b\u7684\u6807\u7b7e\u9875\u7684\u540d\u5b57\n  const [activeTab, setActiveTab] = useState('home')\n  const [, startTransition] = useTransition()\n\n  \/\/ \u70b9\u51fb\u6309\u94ae\uff0c\u5207\u6362\u6fc0\u6d3b\u7684\u6807\u7b7e\u9875\n  const onClickHandler = (tabName: string) => {\n    startTransition(() => {\n      setActiveTab(tabName)\n    })\n  }\n\n  \/\/ \u7701\u7565\u5176\u5b83\u4ee3\u7801...\n}<\/code><\/pre>\n
                      \n
                      \u6b64\u65f6\uff0c\u70b9\u51fb Movie \u6309\u94ae\u540e\uff0c\u72b6\u6001\u7684\u66f4\u65b0\u88ab\u6807\u8bb0\u4e3a\u4f4e\u4f18\u5148\u7ea7<\/strong>\uff0cAbout \u6309\u94ae\u7684 hover \u6548\u679c<\/strong>\u548c\u70b9\u51fb\u64cd\u4f5c<\/strong>\u90fd\u4f1a\u88ab\u7acb\u5373\u54cd\u5e94\u3002<\/p>\n<\/blockquote>\n
                      4. \u4f7f\u7528 isPending \u5c55\u793a\u52a0\u8f7d\u72b6\u6001<\/h3>\n
                      \u4e3a\u4e86\u80fd\u591f\u4f7f\u7528 isPending<\/code> \u7684\u72b6\u6001\u4e3a\u6309\u94ae\u6dfb\u52a0 loading<\/code> \u6548\u679c\uff0c\u6211\u4eec\u9700\u8981\u628a useTransition<\/code> \u7684\u8c03\u7528\u4ece TabsContainer<\/code> \u7ec4\u4ef6\u4e2d\u632a\u5230 TabButton<\/code> \u7ec4\u4ef6\u4e2d\uff1a<\/p>\n
                      \/\/ Button \u7ec4\u4ef6 props \u7684 TS \u7c7b\u578b\ntype TabButtonType = React.PropsWithChildren & { isActive: boolean; onClick: () => void }\n\n\/\/ Button \u7ec4\u4ef6\nconst TabButton: React.FC<TabButtonType> = (props) => {\n  const [isPending, startTransition] = useTransition()\n\n  const onButtonClick = () => {\n    startTransition(() => {\n      props.onClick()\n    })\n  }\n\n  return (\n    <button className={['btn', props.isActive && 'active'].join(' ')} onClick={onButtonClick}>\n      {props.children}\n      {\/* \u5982\u679c\u5904\u4e8e\u66f4\u65b0\u72b6\u6001\uff0c\u5219\u5728\u5bf9\u5e94\u6309\u94ae\u4e2d\u6e32\u67d3\u4e00\u4e2a loading \u56fe\u6807 *\/}\n      {isPending && '\u23f1\ufe0f'}\n    <\/button>\n  )\n}<\/code><\/pre>\n
                      5. \u6ce8\u610f\u4e8b\u9879<\/h3>\n
                        \n
                      1. \u4f20\u9012\u7ed9 startTransition<\/code> \u7684\u51fd\u6570\u5fc5\u987b\u662f\u540c\u6b65\u7684\u3002React \u4f1a\u7acb\u5373\u6267\u884c\u6b64\u51fd\u6570\uff0c\u5e76\u5c06\u5728\u5176\u6267\u884c\u671f\u95f4\u53d1\u751f\u7684\u6240\u6709\u72b6\u6001\u66f4\u65b0\u6807\u8bb0\u4e3a transition\u3002\u5982\u679c\u5728\u5176\u6267\u884c\u671f\u95f4\uff0c\u5c1d\u8bd5\u7a0d\u540e\u6267\u884c\u72b6\u6001\u66f4\u65b0\uff08\u4f8b\u5982\u5728\u4e00\u4e2a\u5b9a\u65f6\u5668\u4e2d\u6267\u884c\u72b6\u6001\u66f4\u65b0\uff09\uff0c\u8fd9\u4e9b\u72b6\u6001\u66f4\u65b0\u4e0d\u4f1a\u88ab\u6807\u8bb0\u4e3a transition\u3002<\/li>\n
                      2. \u6807\u8bb0\u4e3a transition \u7684\u72b6\u6001\u66f4\u65b0\u5c06\u88ab\u5176\u4ed6\u72b6\u6001\u66f4\u65b0\u6253\u65ad<\/strong>\u3002\u4f8b\u5982\u5728 transition \u4e2d\u66f4\u65b0\u56fe\u8868\u7ec4\u4ef6\uff0c\u5e76\u5728\u56fe\u8868\u7ec4\u4ef6\u4ecd\u5728\u91cd\u65b0\u6e32\u67d3\u65f6\u7ee7\u7eed\u5728\u8f93\u5165\u6846\u4e2d\u8f93\u5165\uff0cReact \u5c06\u9996\u5148\u5904\u7406\u8f93\u5165\u6846\u7684\u66f4\u65b0\uff0c\u4e4b\u540e\u518d\u91cd\u65b0\u542f\u52a8\u5bf9\u56fe\u8868\u7ec4\u4ef6\u7684\u6e32\u67d3\u5de5\u4f5c\u3002<\/li>\n
                      3. transition \u66f4\u65b0\u4e0d\u80fd\u7528\u4e8e\u63a7\u5236\u6587\u672c\u8f93\u5165\u3002<\/li>\n<\/ol>\n
                        5. useDeferredValue<\/h2>\n
                        1. \u95ee\u9898\u5f15\u5165<\/h3>\n
                        \u5728\u641c\u7d22\u6846\u6848\u4f8b\u4e2d\uff0cSearchResult \u7ec4\u4ef6\u4f1a\u6839\u636e\u7528\u6237\u8f93\u5165\u7684\u5173\u952e\u5b57<\/strong>\uff0c\u5faa\u73af\u751f\u6210\u5927\u91cf\u7684 p \u6807\u7b7e\uff0c\u56e0\u6b64\u5b83\u662f\u4e00\u4e2a\u6e32\u67d3\u6bd4\u8f83\u8017\u65f6\u7684\u7ec4\u4ef6\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
                        import React, { useState } from 'react'\n\n\/\/ \u7236\u7ec4\u4ef6\nexport const SearchBox: React.FC = () => {\n  const [kw, setKw] = useState('')\n\n  const onInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {\n    setKw(e.currentTarget.value)\n  }\n\n  return (\n    <div style={{ height: 500 }}>\n      <input type="text" value={kw} onChange={onInputChange} \/>\n      <hr \/>\n      <SearchResult query={kw} \/>\n    <\/div>\n  )\n}\n\n\/\/ \u5b50\u7ec4\u4ef6\uff0c\u6e32\u67d3\u5217\u8868\u9879\nconst SearchResult: React.FC<{ query: string }> = (props) => {\n  if (!props.query) return\n  const items = Array(40000)\n    .fill(props.query)\n    .map((item, i) => <p key={i}>{item}<\/p>)\n\n  return items\n}<\/code><\/pre>\n
                        \u6ce8\u610f\uff0c\u6b64\u6848\u4f8b\u4e0d\u80fd\u4f7f\u7528 useTransition<\/code> \u8fdb\u884c\u6027\u80fd\u4f18\u5316\uff0c\u56e0\u4e3a useTransition<\/code> \u4f1a\u628a\u72b6\u6001\u66f4\u65b0\u6807\u8bb0\u4e3a\u4f4e\u4f18\u5148\u7ea7<\/strong>\uff0c\u88ab\u6807\u8bb0\u4e3a transition \u7684\u72b6\u6001\u66f4\u65b0\u5c06\u88ab\u5176\u4ed6\u72b6\u6001\u66f4\u65b0\u6253\u65ad<\/strong>\u3002\u56e0\u6b64\u5728\u9ad8\u9891\u7387\u8f93\u5165\u65f6\uff0c\u4f1a\u5bfc\u81f4\u4e2d\u95f4\u7684\u8f93\u5165\u72b6\u6001\u4e22\u5931<\/strong>\u7684\u95ee\u9898\u3002\u4f8b\u5982\uff1a<\/p>\n
                        import React, { useState, useTransition } from 'react'\n\n\/\/ \u7236\u7ec4\u4ef6\nexport const SearchBox: React.FC = () => {\n  const [kw, setKw] = useState('')\n  \/\/ 1. \u8c03\u7528 useTransition \u51fd\u6570\n  const [, startTransition] = useTransition()\n\n  const onInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {\n    \/\/ 2. \u5c06\u6587\u672c\u6846\u72b6\u6001\u66f4\u65b0\u6807\u8bb0\u4e3a\u201c\u4f4e\u4f18\u5148\u7ea7\u201d\uff0c\u4f1a\u5bfc\u81f4\u4e2d\u95f4\u7684\u8f93\u5165\u72b6\u6001\u4e22\u5931\n    startTransition(() => {\n      setKw(e.currentTarget.value)\n    })\n  }\n\n  return (\n    <div style={{ height: 500 }}>\n      <input type="text" value={kw} onChange={onInputChange} \/>\n      <hr \/>\n      <SearchResult query={kw} \/>\n    <\/div>\n  )\n}\n\n\/\/ \u5b50\u7ec4\u4ef6\uff0c\u6e32\u67d3\u5217\u8868\u9879\nconst SearchResult: React.FC<{ query: string }> = (props) => {\n  if (!props.query) return\n  const items = Array(40000)\n    .fill(props.query)\n    .map((item, i) => <p key={i}>{item}<\/p>)\n\n  return items\n}<\/code><\/pre>\n
                        2. \u8bed\u6cd5\u683c\u5f0f<\/h3>\n
                        useDeferredValue<\/code> \u63d0\u4f9b\u4e00\u4e2a state \u7684\u5ef6\u8fdf\u7248\u672c\uff0c\u6839\u636e\u5176\u8fd4\u56de\u7684\u5ef6\u8fdf\u7684 state<\/strong> \u80fd\u591f\u63a8\u8fdf\u66f4\u65b0 UI \u4e2d\u7684\u67d0\u4e00\u90e8\u5206<\/strong>\uff0c\u4ece\u800c\u8fbe\u5230\u6027\u80fd\u4f18\u5316\u7684\u76ee\u7684\u3002\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n
                        import { useState, useDeferredValue } from 'react';\n\nfunction SearchPage() {\n  const [kw, setKw] = useState('');\n  \/\/ \u6839\u636e kw \u5f97\u5230\u5ef6\u8fdf\u7684 kw\n  const deferredKw = useDeferredValue(kw);\n  \/\/ ...\n}<\/code><\/pre>\n
                        useDeferredValue<\/code> \u7684\u8fd4\u56de\u503c\u4e3a\u4e00\u4e2a\u5ef6\u8fdf\u7248\u7684\u72b6\u6001<\/strong>\uff1a<\/p>\n
                          \n
                        1. \u5728\u7ec4\u4ef6\u9996\u6b21\u6e32\u67d3\u671f\u95f4\uff0c\u8fd4\u56de\u503c\u5c06\u4e0e\u4f20\u5165\u7684\u503c\u76f8\u540c<\/li>\n
                        2. \u5728\u7ec4\u4ef6\u66f4\u65b0\u671f\u95f4\uff0cReact \u5c06\u9996\u5148\u4f7f\u7528\u65e7\u503c<\/strong>\u91cd\u65b0\u6e32\u67d3 UI \u7ed3\u6784\uff0c\u8fd9\u80fd\u591f\u8df3\u8fc7<\/strong>\u67d0\u4e9b\u590d\u6742\u7ec4\u4ef6\u7684 rerender\uff0c\u4ece\u800c\u63d0\u9ad8\u6e32\u67d3\u6548\u7387<\/strong>\u3002\u968f\u540e\uff0cReact \u5c06\u4f7f\u7528\u65b0\u503c\u66f4\u65b0 deferredValue\uff0c\u5e76\u5728\u540e\u53f0\u4f7f\u7528\u65b0\u503c\u91cd\u65b0\u6e32\u67d3\u662f\u4e00\u4e2a\u4f4e\u4f18\u5148\u7ea7\u7684\u66f4\u65b0<\/strong>\u3002\u8fd9\u4e5f\u610f\u5473\u7740\uff0c\u5982\u679c\u5728\u540e\u53f0\u4f7f\u7528\u65b0\u503c\u66f4\u65b0\u65f6 value \u518d\u6b21\u6539\u53d8\uff0c\u5b83\u5c06\u6253\u65ad\u90a3\u6b21\u66f4\u65b0\u3002<\/li>\n<\/ol>\n
                          3. \u95ee\u9898\u89e3\u51b3<\/h3>\n
                          \u6309\u9700\u5bfc\u5165 useDeferredValue<\/code> \u8fd9\u4e2a hooks API\uff0c\u5e76\u57fa\u4e8e\u5b83\u8fdb\u884c\u641c\u7d22\u529f\u80fd\u7684\u6027\u80fd\u4f18\u5316\uff1a<\/p>\n
                          \/\/ 1. \u6309\u9700\u5bfc\u5165 useDeferredValue \u8fd9\u4e2a Hooks API\nimport React, { useState, useDeferredValue } from 'react'\n\n\/\/ \u7236\u7ec4\u4ef6\nexport const SearchBox: React.FC = () => {\n  const [kw, setKw] = useState('')\n  \/\/ 2. \u57fa\u4e8e kw \u7684\u503c\uff0c\u4e3a\u5176\u521b\u5efa\u51fa\u4e00\u4e2a\u5ef6\u8fdf\u7248\u7684 kw \u503c\uff0c\u547d\u540d\u4e3a deferredKw\n  const deferredKw = useDeferredValue(kw)\n\n  const onInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {\n    setKw(e.currentTarget.value)\n  }\n\n  return (\n    <div style={{ height: 500 }}>\n      <input type="text" value={kw} onChange={onInputChange} \/>\n      <hr \/>\n      {\/* 3. \u5c06\u5ef6\u8fdf\u7248\u7684 kw \u503c\uff0c\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u4f7f\u7528 *\/}\n      <SearchResult query={deferredKw} \/>\n    <\/div>\n  )\n}\n\n\/\/ \u5b50\u7ec4\u4ef6\uff0c\u6e32\u67d3\u5217\u8868\u9879\n\/\/ 4. \u5b50\u7ec4\u4ef6\u5fc5\u987b\u4f7f\u7528 React.memo() \u8fdb\u884c\u5305\u88f9\uff0c\u8fd9\u6837\u5f53 props \u6ca1\u6709\u53d8\u5316\u65f6\uff0c\u4f1a\u8df3\u8fc7\u5b50\u7ec4\u4ef6\u7684 rerender\nconst SearchResult: React.FC<{ query: string }> = React.memo((props) => {\n  if (!props.query) return\n  const items = Array(40000)\n    .fill(props.query)\n    .map((item, i) => <p key={i}>{item}<\/p>)\n\n  return items\n})<\/code><\/pre>\n
                          4. \u8868\u660e\u5185\u5bb9\u5df2\u8fc7\u65f6<\/h3>\n
                          \u5f53 kw<\/code> \u7684\u503c\u9891\u7e41\u66f4\u65b0\u65f6\uff0cdeferredKw<\/code> \u7684\u503c\u4f1a\u660e\u663e\u6ede\u540e\uff0c\u6b64\u65f6\u7528\u6237\u5728\u9875\u9762\u4e0a\u770b\u5230\u7684\u5217\u8868\u6570\u636e\u5e76\u4e0d\u662f\u6700\u65b0\u7684\uff0c\u4e3a\u4e86\u9632\u6b62\u7528\u6237\u611f\u5230\u56f0\u60d1\uff0c\u6211\u4eec\u53ef\u4ee5\u7ed9\u5185\u5bb9\u6dfb\u52a0 opacity \u900f\u660e\u5ea6\uff0c\u8868\u660e\u5f53\u524d\u770b\u5230\u7684\u5185\u5bb9\u5df2\u8fc7\u65f6<\/strong>\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
                          \/\/ 1. \u6309\u9700\u5bfc\u5165 useDeferredValue \u8fd9\u4e2a Hooks API\nimport React, { useState, useDeferredValue } from 'react'\n\n\/\/ \u7236\u7ec4\u4ef6\nexport const SearchBox: React.FC = () => {\n  const [kw, setKw] = useState('')\n  \/\/ 2. \u57fa\u4e8e kw \u7684\u503c\uff0c\u4e3a\u5176\u521b\u5efa\u51fa\u4e00\u4e2a\u5ef6\u8fdf\u7248\u7684 kw \u503c\n  const deferredValue = useDeferredValue(kw)\n\n  const onInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {\n    setKw(e.currentTarget.value)\n  }\n\n  return (\n    <div style={{ height: 500 }}>\n      <input type="text" value={kw} onChange={onInputChange} \/>\n      <hr \/>\n      {\/* 3. \u5c06\u5ef6\u8fdf\u7248\u7684 kw \u503c\uff0c\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u4f7f\u7528 *\/}\n      <div style={{ opacity: kw !== deferredValue ? 0.3 : 1, transition: 'opacity 0.5s ease' }}>\n        <SearchResult query={deferredValue} \/>\n      <\/div>\n    <\/div>\n  )\n}<\/code><\/pre>\n
                          \n
                          \u7248\u6743\u5f52\u4f5c\u8005 \u00a9\u5218\u9f99\u5bbe \u6240\u6709\uff0c\u672c\u6587\u7ae0\u672a\u7ecf\u4f5c\u8005\u5141\u8bb8\uff0c\u7981\u6b62\u79c1\u81ea\u8f6c\u8f7d\uff01<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
                          \u7248\u6743\u5f52\u4f5c\u8005 \u00a9\u5218\u9f99\u5bbe \u6240\u6709\uff0c\u672c\u6587\u7ae0\u672a\u7ecf\u4f5c\u8005\u5141\u8bb8\uff0c\u7981\u6b62\u79c1\u81ea\u8f6c\u8f7d\uff01 1. React.memo \u5f53\u7236\u7ec4\u4ef6\u88ab\u91cd\u65b0\u6e32\u67d3\u7684\u65f6\u5019\uff0c\u4e5f\u4f1a\u89e6\u53d1\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\uff0c\u8fd9\u6837\u5c31\u591a\u51fa\u4e86\u65e0\u610f\u4e49\u7684\u6027\u80fd\u5f00\u9500\u3002\u5982\u679c\u5b50\u7ec4\u4ef6\u7684\u72b6\u6001\u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0c\u5219\u5b50\u7ec4\u4ef6\u662f\u4e0d\u9700\u8981\u88ab\u91cd\u65b0\u6e32\u67d3\u7684\u3002 \u5728 React Hooks \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 React.memo \u6765\u89e3\u51b3\u4e0a\u8ff0\u7684\u95ee\u9898\uff0c\u4ece\u800c\u8fbe\u5230\u63d0\u9ad8\u6027\u80fd\u7684\u76ee\u7684\u3002 React.memo \u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a const \u7ec4\u4ef6 = React.memo(\u51fd\u6570\u5f0f\u7ec4\u4ef6) \u4f8b\u5982\uff0c\u5728\u4e0b\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u7236\u7ec4\u4ef6\u58f0\u660e\u4e86 count \u548c flag \u4e24\u4e2a\u72b6\u6001\uff0c\u5b50\u7ec4\u4ef6\u4f9d\u8d56\u4e8e\u7236\u7ec4\u4ef6\u901a\u8fc7 props \u4f20\u9012\u7684 num\u3002\u5f53\u7236\u7ec4\u4ef6\u4fee\u6539 flag \u7684\u503c\u65f6\uff0c\u4f1a\u5bfc\u81f4\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\uff1a import React, { useEffect, useState } from 'react' \/\/ \u7236\u7ec4\u4ef6 export const Father: React.FC = () => { \/\/ \u5b9a\u4e49 count \u548c flag \u4e24\u4e2a\u72b6\u6001 const [count, setCount] = useState(0) const [flag, setFlag] = useState(false) return ( <> <h1>\u7236\u7ec4\u4ef6<\/h1> <p>count \u7684\u503c\u662f\uff1a{count}<\/p> <p>flag \u7684\u503c\u662f\uff1a{String(flag)}<\/p> <button onClick={() => setCount((prev) => prev + 1)}>+1<\/button> <button onClick={() => setFlag((prev) => !prev)}>Toggle<\/button> <hr \/> <Son num={count} \/> <\/> ) } \/\/ \u5b50\u7ec4\u4ef6\uff1a\u4f9d\u8d56\u4e8e\u7236\u7ec4\u4ef6\u901a\u8fc7 props \u4f20\u9012\u8fdb\u6765\u7684 num export const Son: React.FC<{ num: number }> = ({ num }) => { useEffect(() => { console.log('\u89e6\u53d1\u4e86\u5b50\u7ec4\u4ef6\u7684\u6e32\u67d3') }) return ( <> <h3>\u5b50\u7ec4\u4ef6 {num}<\/h3> <\/> ) } \u6211\u4eec\u4f7f\u7528 React.memo(\u51fd\u6570\u5f0f\u7ec4\u4ef6) \u5c06\u5b50\u7ec4\u4ef6\u5305\u88f9\u8d77\u6765\uff0c\u53ea\u6709\u5b50\u7ec4\u4ef6\u4f9d\u8d56\u7684 props \u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\uff0c\u624d\u4f1a\u89e6\u53d1\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a \/\/ \u5b50\u7ec4\u4ef6\uff1a\u4f9d\u8d56\u4e8e\u7236\u7ec4\u4ef6\u901a\u8fc7 props \u4f20\u9012\u8fdb\u6765\u7684 num export const Son: React.FC<{ num: number }> = React.memo(({ num }) => { useEffect(() => { console.log('\u89e6\u53d1\u4e86\u5b50\u7ec4\u4ef6\u7684\u6e32\u67d3') }) return ( <> <h3>\u5b50\u7ec4\u4ef6 — {num}<\/h3> <\/> ) }) 2. useMemo 1. \u95ee\u9898\u5f15\u5165 \u8fdb\u4e00\u6b65\u6539\u9020\u524d\u9762\u7684\u6848\u4f8b\uff1a\u6211\u4eec\u5e0c\u671b\u5728 Father \u7ec4\u4ef6\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u201c\u8ba1\u7b97\u5c5e\u6027\u201d\uff0c\u6839\u636e flag \u503c\u7684\u771f\u5047\uff0c\u52a8\u6001\u8fd4\u56de\u4e00\u6bb5\u6587\u672c\u5185\u5bb9\uff0c\u5e76\u628a\u8ba1\u7b97\u7684\u7ed3\u679c\u663e\u793a\u5230\u9875\u9762\u4e0a\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a \/\/ \u7236\u7ec4\u4ef6 export const Father: React.FC = () => { \/\/ \u5b9a\u4e49 count \u548c flag \u4e24\u4e2a\u72b6\u6001 const [count, setCount] = useState(0) const [flag, setFlag] = useState(false) \/\/ \u6839\u636e\u5e03\u5c14\u503c\u8fdb\u884c\u8ba1\u7b97\uff0c\u52a8\u6001\u8fd4\u56de\u5185\u5bb9 const tips = () => { console.log('\u89e6\u53d1\u4e86 tips \u7684\u91cd\u65b0\u8ba1\u7b97') return flag ? <p>\u54ea\u91cc\u8d35\u4e86\uff0c\u4e0d\u8981\u7741\u7740\u773c\u778e\u8bf4\u597d\u4e0d\u597d<\/p> : <p>\u8fd9\u4e9b\u5e74\u6709\u6ca1\u6709\u52aa\u529b\u5de5\u4f5c\uff0c\u5de5\u8d44\u6da8\u6ca1\u6da8<\/p> } return ( <> <h1>\u7236\u7ec4\u4ef6<\/h1> <p>count \u7684\u503c\u662f\uff1a{count}<\/p> <p>flag \u7684\u503c\u662f\uff1a{String(flag)}<\/p> {tips()} <button onClick={() => se…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,15],"tags":[18,17,20,19],"class_list":["post-598","post","type-post","status-publish","format-standard","hentry","category-hooks","category-react","tag-hooks","tag-react","tag-react-hook","tag-react-hooks"],"_links":{"self":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts\/598","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/comments?post=598"}],"version-history":[{"count":8,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts\/598\/revisions"}],"predecessor-version":[{"id":609,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/posts\/598\/revisions\/609"}],"wp:attachment":[{"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/media?parent=598"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/categories?post=598"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.escook.cn\/index.php\/wp-json\/wp\/v2\/tags?post=598"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}